The facebook share button has been deprecated in favor of the like button. From their docs:
The Share button has been deprecated in favor of the Like button, and
will no longer be supported. Please use the Like button whenever
possible to drive maximum traffic to your apps.
You can use the event with the like button, however if you want to track the shared button then it is still possible with some javascript. You can add a click event to your FB share button.
Here is an example I'm using.
window.fbAsyncInit = function () {
FB.init({
appId: 'your app id',
status: true,
cookie: true,
xfbml: true,
oauth: true
});
$('#facebook-share').click(function () {
FB.ui({
method: 'feed',
link: document.URL,
caption: 'example',
}, function (response) {
if (response === null) {
console.log('post was not shared');
} else {
console.log('post was shared');
}
});
});
};
(function (d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.async = true;
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));